2 April 2019
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Data
The seals data set from the ggplot2 R package consists of
## lat long delta_long delta_lat
## Min. :29.7 Min. :-172.8 Min. :-2.0671 Min. :-0.45794
## 1st Qu.:34.7 1st Qu.:-159.8 1st Qu.:-0.8222 1st Qu.: 0.01162
## Median :39.7 Median :-145.8 Median :-0.5818 Median : 0.12571
## Mean :39.7 Mean :-145.8 Mean :-0.5633 Mean : 0.14145
## 3rd Qu.:44.7 3rd Qu.:-131.8 3rd Qu.:-0.3168 3rd Qu.: 0.24642
## Max. :49.7 Max. :-118.8 Max. : 0.2578 Max. : 0.76436
Basically it's the vector field representation of seal movements in the Pacific Ocean.
- The long and lat variables represent the x and y coordinates of a grid where the measurements are taken.
- The delta_long and delta_lat variables represent the x and y components of the displacement vector.
Vector field
Countour plot
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The magnitude of the displacement is color-coded on the longitude-latitude grid with added contour lines.
Overall the displacement increase going towards the south-east corner of the grid.
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Radar plot
Mean displacement for fixed longitude and latitude. Colors code the mean longitude and latitude components of the mean displacement.
Notice from the sign of the colors that the movement go from 45 to 30 degrees of latitude, and from -120 to -180 degrees of longitude. On the latitude the displacement magnitude increase linearly, while there is an increase/decrease around -135 degrees on the longitude.